[Github-comments] [geany/geany] Regex. Empty line not fond in text with repeated subpattern (#2096)

[Aleksey]

Good day.
Found the following.

Geany: Geany 1.34.1, Russian_Russia.1251
Geany: GTK 2.24.32, GLib 2.58.1

**1.**
Consider the following plain text:

```
123




456

```

After 123 follow five empty lines, field 456 follows one empty line.

**2.**
Open **Search/Find**
**Search for**: `(?s)^(.*)\n(.*\1)`
**Replace for**: `\2`
[v] Use regular expressions
[v] Use multi-line matching

**3**.
Repeat pressed button "In document" while replace not stoped and get next text:
```
123

456

```

**4.**
Create a new empty file and paste the text from step 3

**5.**
Repeat the procedure from steps 2 and 3. The line between 123 and 456 will be deleted.
Can you tell me what is wrong? 

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